I have problem with Empty Field Value

Hi, iam using StarterConsumer_BatchView.

We set to View only BID,ASK,TRDPRC_1,HST_CLOSE,HSTCLSDATE,TRDVOL_1.

What i found is that some time i have a new Refresh where BID or ASK is empty.

Example

2019/08/30 16:55:54.638 TRACE <- Received MMT_MARKET_PRICE Update  itemName    :     OGZD.BA  itemHandle  :     171862208  itemFrom    :    BatchItemList1  FieldList : standard data count = 2FieldEntry [    22] BID                 5.7410 FieldEntry [    25] ASK                 

My question is: How should I interpret it? Like there is no Offert? For us that's will mean null or 0, so there will be no display to the client of that ASK or BID.

Micheal